The patch titled
Subject: device-dax: correct pgoff align in dax_set_mapping()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
device-dax-correct-pgoff-align-in-dax_set_mapping.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/device-dax-correct-pgoff-align-in-dax_set_mapping.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Kun(llfl)" <llfl@xxxxxxxxxxxxxxxxx>
Subject: device-dax: correct pgoff align in dax_set_mapping()
Date: Fri, 27 Sep 2024 15:45:09 +0800
pgoff should be aligned using ALIGN_DOWN() instead of ALIGN(). Otherwise,
vmf->address not aligned to fault_size will be aligned to the next
alignment, that can result in memory failure getting the wrong address.
Link: https://lkml.kernel.org/r/23c02a03e8d666fef11bbe13e85c69c8b4ca0624.1727421694.git.llfl@xxxxxxxxxxxxxxxxx
Fixes: b9b5777f09be ("device-dax: use ALIGN() for determining pgoff")
Signed-off-by: Kun(llfl) <llfl@xxxxxxxxxxxxxxxxx>
Tested-by: JianXiong Zhao <zhaojianxiong.zjx@xxxxxxxxxxxxxxx>
Cc: Joao Martins <joao.m.martins@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/dax/device.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/dax/device.c~device-dax-correct-pgoff-align-in-dax_set_mapping
+++ a/drivers/dax/device.c
@@ -86,7 +86,7 @@ static void dax_set_mapping(struct vm_fa
nr_pages = 1;
pgoff = linear_page_index(vmf->vma,
- ALIGN(vmf->address, fault_size));
+ ALIGN_DOWN(vmf->address, fault_size));
for (i = 0; i < nr_pages; i++) {
struct page *page = pfn_to_page(pfn_t_to_pfn(pfn) + i);
_
Patches currently in -mm which might be from llfl@xxxxxxxxxxxxxxxxx are
device-dax-correct-pgoff-align-in-dax_set_mapping.patch
